Sam Lutfi: Britney Spears Totally on Meth, Nanny Totally Lying

Britney Spears' ex-nanny is a liar and a fraud, according to the liar/fraud who is suing the pop star.

Sam Lutfi says Leah Frand was fired after a week and wouldn't have had a clue about Spears' drug use, which she denied and which is central to Sam's lawsuit.

Britney in 2007 ... does she look like a meth addict to you?

Frand claimed Friday that she worked for Britney for six months back in 2007 - during Spears' head-shaving, crazy meltdown period - and never once saw any drugs.

Sam Lutfi counters that Frand was fired for stealing one of Britney's dresses (which she later returned) and is not the least bit credible when it comes to Britney's meth use.

Lutfi also wants to clarify that he never said Britney did crystal meth, per se, only that he found a stash of crystal meth in her house while he was her manager in 2007.

As for accusations that he drugged her using Adderall, Sam says Britney Spears fueled herself, taking WAY more than the recommended dose of her (legal) prescription.

He's seeking back wages plus damages for defamation. Stay tuned.